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2. calculate the voltage of the ff cell
Zn/Zn^+ (0.10M)// Cu^2+(0.40M)/Cu
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- Calculate the minimum difference in standard electrode potentials needed to lower the concentration of the metal M1 to 2.00 10-4 M ¡n a solution that is 1.00 10-1 M in the less-reducible metal M2 where (a) M2 is univalent and M1 is divalent. (b) M2 and M1 are both divalent, (c) M2 is trivalent and M1 is univalent, (d) M2is divalent and M1 is univalent, (e) M2 is divalent and M1 ¡s trivalent.The following cell was found to have a potential of —0.492 V: Ag|AgCl(sat’d)||HA(0.200 M),NaA(0.300 M)|H2(1.00 atm),Pt Calculate the dissociation constant of HA, neglecting the junction potential.Calculate the electrode potentials for the following systems: (a) Cr2O72-(5.00 10-3 M),Cr3+(2.50 10-2 M),H+ (0.100 M)|Pt (b) UO22+(0.100 M),U4+ (0.200 M),H+ (0.600 M)|Pt
- A small part with a surface area of 3.0 cm2 is plated with a gold coating that is 5.00x10-4 mm thick. The density of gold is 19.32 g/cm3. a) What mass of gold is in this coating? b) If a barrel plating run has 6000 of these parts in a single barrel, how long would the run take if the current was 15 A? (Gold is effectively plated from Au+(aq)A small part with a surface area of 2.62 cm2 is plated with a gold coating that is 5.00 10–4 mm thick. The density of gold is 19.32 g cm–3. (a) What mass of gold is in this coating? (b) If a barrel plating run has 5,000 of these parts in a single barrel, how long would the run take if the current was 15.0 A? (Gold is effectively plated from Au+(aq).)It is desired to separate silver in a solution that is 0.06130.0613 M BiO+BiO+, 0.1290.129 M Cu2+Cu2+, 0.09550.0955 M Ag+Ag+, and 0.5000.500 M HClO4HClO4 by controlled-potential electrolysis
- .A conductance cell filled with 0.01 M solution of an electrolyte offered a resistance of 2300 ohms. If the electrodes of the cell are 1.90 cm apart and have an area of cross-section equal to 4.70 sq cm, calculate specific conductance Calculate molar activityWhat happens to the mass of deposited Cu when the applied current is increased?Calculate the standard potential and the Ecell of Pt ǀ Fe2+ (0.05), Fe3+ (0.01) ǁ MnO-4 (0.02), Mn2+ (0.008) ǀ C
- How long does it take to deposit a coating of gold 1.00 μm thick on a disk-shaped medallion 4.00 cm in diameter and 2.00 mm thick at constant current of 89 A? The density of gold is 19.3 g/cm3 and the gold is from an Au(III) solution. ____ sThe cell potential for Cr | Cr+3 (0.50 M) || Ce+4(0.0025M), Ce+3 (0.35 M) | Pt is 1.99 V 2.23 V 2.35 V 2.47V 2.32 VThe voltammogram for 20.00 mL of solution that was 3.65 x 10-3M in Cd2+ gave a wave for that ion with a limiting current of 31.3 A. Calculate the percentage change in concentration of the solution if the current in the limiting current region were allowed to continue for a) 5 min; b) 10 min and c) 30 min.